/*

The contents of this web application are subject to the Mozilla Public License Version 1.1 (the "License"); you may not use this web application except in compliance with the License. 
You may obtain a copy of the License at http://www.mozilla.org/MPL/.

Software distributed under the License is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. 
See the License for the specific language governing rights and limitations under the License.

The Original Code is owned by and the Initial Developer of the Original Code is Composite A/S (Danish business reg.no. 21744409). All Rights Reserved

Section 11 of the License is EXPRESSLY amended to include a provision stating that any dispute, including but not limited to disputes related to the enforcement of the License, to which Composite A/S as owner of the Original Code, as Initial Developer or in any other role, becomes a part to shall be governed by Danish law and be initiated before the Copenhagen City Court ("K�benhavns Byret")
                        
*/

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Composite.C1Console.Security;
using Composite.C1Console.Events;


namespace Composite.C1Console.Actions
{
    internal class BeforeActionEventArgs : EventArgs
    {
        public BeforeActionEventArgs(EntityToken entityToken, ActionToken actionToken)
        {
            this.EntityToken = entityToken;
            this.ActionToken = actionToken;
        }


        public EntityToken EntityToken { get; private set; }
        public ActionToken ActionToken { get; private set; }
    }



    internal class AfterActionEventArgs : EventArgs
    {
        public AfterActionEventArgs(EntityToken entityToken, ActionToken actionToken, FlowToken flowToken)
        {
            this.EntityToken = entityToken;
            this.ActionToken = actionToken;
            this.FlowToken = flowToken;
        }


        public EntityToken EntityToken { get; private set; }
        public ActionToken ActionToken { get; private set; }
        public FlowToken FlowToken { get; private set; }
    }



    internal static class ActionEventSystemFacade
    {
        internal delegate void OnBeforeActionExecutionDelegate(BeforeActionEventArgs actionEventArgs);
        internal delegate void OnAfterActionExecutionDelegate(AfterActionEventArgs actionEventArgs);


        private static OnBeforeActionExecutionDelegate _onBeforeActionExecutionDelegates = null;
        private static OnAfterActionExecutionDelegate _onAfterActionExecutionDelegates = null;



        static ActionEventSystemFacade()
        {
            GlobalEventSystemFacade.SubscribeToFlushEvent(OnFlushEvent);
        }



        public static void SubscribeToOnBeforeActionExecution(OnBeforeActionExecutionDelegate onBeforeActionExecutionDelegate)
        {
            Verify.ArgumentNotNull(onBeforeActionExecutionDelegate, "onBeforeActionExecutionDelegate");

            _onBeforeActionExecutionDelegates += onBeforeActionExecutionDelegate;
        }



        public static void UnsubscribeToOnBeforeActionExecution(OnBeforeActionExecutionDelegate onBeforeActionExecutionDelegate)
        {
            Verify.ArgumentNotNull(onBeforeActionExecutionDelegate, "onBeforeActionExecutionDelegate");

            _onBeforeActionExecutionDelegates -= onBeforeActionExecutionDelegate;
        }



        public static void SubscribeToOnAfterActionExecution(OnAfterActionExecutionDelegate onAfterActionExecutionDelegate)
        {
            Verify.ArgumentNotNull(onAfterActionExecutionDelegate, "onAfterActionExecutionDelegate");

            _onAfterActionExecutionDelegates += onAfterActionExecutionDelegate;
        }



        public static void UnsubscribeToOnAfterActionExecution(OnAfterActionExecutionDelegate onAfterActionExecutionDelegate)
        {
            Verify.ArgumentNotNull(onAfterActionExecutionDelegate, "onAfterActionExecutionDelegate");

            _onAfterActionExecutionDelegates -= onAfterActionExecutionDelegate;
        }



        internal static void FireOnBeforeActionExecution(EntityToken entityToken, ActionToken actionToken)
        {
            if (_onBeforeActionExecutionDelegates != null)
            {
                _onBeforeActionExecutionDelegates(new BeforeActionEventArgs(entityToken, actionToken));
            }
        }



        internal static void FireOnAfterActionExecution(EntityToken entityToken, ActionToken actionToken, FlowToken flowToken)
        {
            if (_onAfterActionExecutionDelegates != null)
            {
                _onAfterActionExecutionDelegates(new AfterActionEventArgs(entityToken, actionToken, flowToken));
            }
        }



        private static void Flush()
        {
            _onBeforeActionExecutionDelegates = null;
            _onAfterActionExecutionDelegates = null;
        }



        private static void OnFlushEvent(FlushEventArgs args)
        {
            Flush();
        }
    }
}
